Livestock Troubleshooting: Poor Weight Gain

How do I know an animal is not gaining as it should?

Weighing is the best check, and a livestock scale or a weight tape appropriate to the species gives you a trend. Body condition scoring, which uses hands-on feel over ribs, spine and hips, works when you cannot weigh. Your extension office can show you the scoring system for your species.

Compare the animal with others of the same age, breed and class in the same pen. A single thin animal in a well-fed group points toward a health or social problem, while a whole group falling behind points toward feed or management.

Set a baseline for each animal when it arrives or is born. Without a starting number, you cannot tell slow gain from normal gain. Even a simple notebook with a date, a weight or score and a line about the pasture or ration gives you a record you can share with your veterinarian.

• Weigh or score on a regular schedule
• Record dates and numbers
• Compare with herd mates, not with photos

Is the feed enough in quantity and quality?

Many weight gain problems begin with the ration. Pasture that has stopped growing, hay that was cut late or stored poorly, and grain that does not match the animal's needs all leave animals short. Growing, pregnant and lactating animals need more than adults at maintenance.

Have your hay tested through a lab your extension office recommends, and ask a nutritionist or extension agent to help you balance a ration. Guessing based on the look of the hay often leads to mistakes.

Remember that forage quality changes through the season. Spring grass is high in moisture and low in dry matter, summer pasture may stall in heat or drought, and winter hay may not meet the needs of growing or nursing animals. Compare what animals are eating with what they need at each stage, and adjust before body condition slips.

• Test hay or forage for nutrient content
• Match feed to age and production stage
• Provide free-choice minerals suited to your species and region

Could parasites be holding the animal back?

Internal parasites are a leading cause of poor growth in cattle, sheep and goats, and external parasites such as lice and mites also drain animals. Signs include a rough coat, a pot belly, diarrhea, pale gums or eyelids, and weakness.

Work with your veterinarian on a testing and management plan, since resistance to dewormers is a serious and growing problem and blind treatment can make it worse. Pasture rotation and stocking rates also matter, and your vet can advise on both.

• Ask your vet about fecal testing
• Do not treat the whole herd without guidance
• Rest pastures and avoid overgrazing

What about teeth, feet and competition at the feeder?

An older animal with worn or missing teeth may not chew well, and a lame animal may not travel to feed and water. Shy or low-ranking animals are often pushed away from feeders by more dominant ones.

Watch feeding time quietly. If one animal hangs back or eats very little, give it a separate space and feed, and ask your vet to check its teeth and feet.

Look at group makeup too. Mixing very different ages or sizes in one pen often leaves smaller animals at a disadvantage, and a change in the pecking order after adding or removing an animal can set one back. Sorting animals into groups that match in size and need makes feeding fairer.

• Provide enough feeder space for every animal
• Check for dropped feed or unchewed material
• Separate bullied animals for a time

Do water, weather and stress play a part?

Animals that drink too little eat less, so check that water is clean, cool in summer and unfrozen in winter. Heat and cold both raise energy needs or cut appetite, and stress from weaning, transport or new groups slows growth.

Shelter, shade and wind protection all reduce the energy an animal spends staying comfortable.

• Scrub water containers regularly
• Provide shade and wind protection
• Introduce new animals gradually

When should I call the veterinarian?

Call if an animal is losing weight, is lethargic, has diarrhea, coughs, stops eating or shows any sign of illness. Weight loss can be an early sign of a serious disease, and waiting often makes treatment harder.

Ask also about local reporting and biosecurity requirements, since rules vary by state. Your state veterinarian or extension office can tell you which diseases must be reported where you live.

Bring your records to the appointment. Weights, feed types, pasture notes, recent changes and any signs you have seen help your vet decide what to test and what to rule out. Do not give leftover or borrowed medication, since the wrong product or a wrong dose can harm the animal and complicate the diagnosis.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.